diff --git a/clib/cdynarr.c b/clib/cdynarr.c
new file mode 100644
index 0000000..e16cbb1
--- /dev/null
+++ b/clib/cdynarr.c
@@ -0,0 +1,93 @@
+
+/*
+ *
+ * Copyright 2023 Oleg Borodin  <borodin@unix7.org>
+ *
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include <cdynarr.h>
+
+
+#define INIT_CAPA 64
+
+/* Integer array */
+cintarr_t* new_cintarr(void) {
+        cintarr_t* arr = malloc(sizeof(cintarr_t));
+        if (arr == NULL) return NULL;
+        if (cintarr_init(arr) == NULL) {
+            cintarr_free(arr);
+            return NULL;
+        }
+        return arr;
+}
+
+void* cintarr_init(cintarr_t* array) {
+    array->data = malloc(INIT_CAPA * sizeof(int64_t));
+    if (array->data == NULL) return NULL;
+    memset(array->data, 0, INIT_CAPA);
+    array->capa = INIT_CAPA;
+    array->size = 0;
+    return array->data;
+}
+
+void* cintarr_append(cintarr_t* array, int64_t add) {
+    if (array->size + 1 > array->capa) {
+        size_t newcapa = (array->capa * 10) / 6 ;
+        int64_t* newarray = realloc(array->data, newcapa);
+        if (newarray == NULL) return NULL;
+        array->capa = newcapa;
+        array->data = newarray;
+    }
+    array->data[array->size++] = add;
+    return array->data;
+}
+
+int64_t* cintarr_getref(cintarr_t* array) {
+    return array->data;
+}
+
+void cintarr_destroy(cintarr_t* array) {
+    if (array == NULL) return;
+    free(array->data);
+}
+
+void cintarr_free(cintarr_t* array) {
+    cintarr_destroy(array);
+    free(array->data);
+}
+
+
+/* Float array */
+void* cfltarr_init(cfltarr_t* array) {
+    array->data = malloc(INIT_CAPA * sizeof(double));
+    if (array->data == NULL) return NULL;
+    memset(array->data, 0, INIT_CAPA);
+    array->capa = INIT_CAPA;
+    array->size = 0;
+    return array->data;
+}
+
+void* cfltarr_append(cfltarr_t* array, double add) {
+    if (array->size + 1 > array->capa) {
+        size_t newcapa = (array->capa * 10) / 6 ;
+        double* newarray = realloc(array->data, newcapa);
+        if (newarray == NULL) return NULL;
+        array->capa = newcapa;
+        array->data = newarray;
+    }
+    array->data[array->size++] = add;
+    return array->data;
+}
+
+double* cfltarr_getref(cfltarr_t* array) {
+    return array->data;
+}
+
+void cfltarr_destroy(cfltarr_t* array) {
+    if (array == NULL) return;
+    free(array->data);
+}
diff --git a/clib/cdynarr.h b/clib/cdynarr.h
new file mode 100644
index 0000000..184b49b
--- /dev/null
+++ b/clib/cdynarr.h
@@ -0,0 +1,49 @@
+
+#ifndef CDYNARR_H_QWERTY
+#define CDYNARR_H_QWERTY
+
+#include <stdint.h>
+#include <stdbool.h>
+
+
+typedef struct {
+    int64_t* data;
+    int capa;
+    int size;
+} cintarr_t;
+
+typedef struct {
+    bool* data;
+    int capa;
+    int size;
+} cboolarr_t;
+
+typedef struct {
+    double* data;
+    int capa;
+    int size;
+} cfltarr_t;
+
+
+cintarr_t* new_cintarr(void);
+void* cintarr_init(cintarr_t* array);
+void* cintarr_append(cintarr_t* array, int64_t add);
+int64_t* cintarr_getref(cintarr_t* array);
+void cintarr_destroy(cintarr_t* array);
+void cintarr_free(cintarr_t* array);
+
+cfltarr_t* new_cfltarr(void);
+void* cfltarr_init(cfltarr_t* array);
+void* cfltarr_append(cfltarr_t* array, double add);
+double* cfltarr_getref(cfltarr_t* array);
+void cfltarr_destroy(cfltarr_t* array);
+void cfltarr_free(cfltarr_t* array);
+
+cboolarr_t* new_cboolarr(void);
+void* cboolarr_init(cboolarr_t* array);
+void* cboolarr_append(cboolarr_t* array, bool add);
+bool* cboolarr_getref(cboolarr_t* array);
+void cboolarr_destroy(cboolarr_t* array);
+void cboolarr_free(cboolarr_t* array);
+
+#endif
diff --git a/clib/cdynarr_test.c b/clib/cdynarr_test.c
new file mode 100644
index 0000000..bb505b8
--- /dev/null
+++ b/clib/cdynarr_test.c
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2022 Oleg Borodin  <borodin@unix7.org>
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+
+#include <massert.h>
+#include <cdynarr.h>
+
+
+void test01(void) {
+}
+
+int main(void) {
+    test01();
+    return 0;
+}
diff --git a/clib/cstring.c b/clib/cstring.c
new file mode 100644
index 0000000..afdf300
--- /dev/null
+++ b/clib/cstring.c
@@ -0,0 +1,51 @@
+
+/*
+ *
+ * Copyright 2023 Oleg Borodin  <borodin@unix7.org>
+ *
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include <cstring.h>
+
+#define INIT_CAPA 64
+
+/* String container */
+void* cstring_init(cstring_t* str) {
+    str->data = malloc(INIT_CAPA + 1);
+    if (str->data == NULL) return NULL;
+    memset(str->data, '\0', INIT_CAPA + 1);
+    str->capa = INIT_CAPA;
+    str->size = 0;
+    return str->data;
+}
+
+
+void* cstring_append(cstring_t* str, char* add) {
+    size_t addsize = strlen(add);
+    size_t newsize = str->size + addsize;
+    if (newsize >= str->capa) {
+        size_t newcapa = newsize + 1;
+        char* newstr = realloc(str->data, newcapa);
+        if (newstr == NULL) return NULL;
+        str->data = newstr;
+        str->capa = newcapa;
+    }
+    strcpy(&(str->data[str->size]), add);
+    str->data[newsize + 1] = '\0';
+    str->size = newsize;
+    return str->data;
+}
+
+char* cstring_getref(cstring_t* str) {
+    return str->data;
+}
+
+
+void cstring_destroy(cstring_t* str) {
+    if (str == NULL) return;
+    free(str->data);
+}
diff --git a/clib/cstring.h b/clib/cstring.h
new file mode 100644
index 0000000..70ad58d
--- /dev/null
+++ b/clib/cstring.h
@@ -0,0 +1,17 @@
+
+#ifndef CSTRING_H_QWERTY
+#define CSTRING_H_QWERTY
+
+typedef struct {
+    char* data;
+    int capa;
+    int size;
+} cstring_t;
+
+
+void* cstring_init(cstring_t* str);
+void* cstring_append(cstring_t* str, char* add);
+char* cstring_getref(cstring_t* str);
+void cstring_destroy(cstring_t* str);
+
+#endif
diff --git a/clib/cstring_test.c b/clib/cstring_test.c
new file mode 100644
index 0000000..cb93263
--- /dev/null
+++ b/clib/cstring_test.c
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 Oleg Borodin  <borodin@unix7.org>
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+
+#include <massert.h>
+#include <cstring.h>
+
+
+void test01(void) {
+
+    cstring_t str;
+    cstring_init(&str);
+    cstring_append(&str, "qwerty");
+    cstring_append(&str, "123456");
+
+    cstring_append(&str, "qwerty");
+    cstring_append(&str, "123456");
+
+    cstring_append(&str, "qwerty");
+    cstring_append(&str, "123456");
+
+    cstring_append(&str, "qwerty");
+    cstring_append(&str, "123456");
+
+    cstring_append(&str, "qwerty");
+    cstring_append(&str, "123456");
+
+    printf("%s\n", cstring_getref(&str));
+
+    cstring_destroy(&str);
+}
+
+int main(void) {
+    test01();
+    return 0;
+}