feat: file 2 added

0x0B-malloc_free/2-str_concat.c

@@ -0,0 +1,46 @@
+#include "main.h"
+#include <stdlib.h>
+
+/**
+ * str_concat - Concatenates two strings.
+ * @s1: The string to be concatenated upon.
+ * @s2: The string to be concatenated to s1.
+ *
+ * Return: If concatenation fails - NULL.
+ *         Otherwise - a pointer the newly-allocated space in memory
+ *                     containing the concatenated strings.
+ */
+char *str_concat(char *s1, char *s2)
+{
+	char *concat;
+	unsigned int i;
+	unsigned int j;
+	unsigned int length_S1;
+	unsigned int length_S2;
+	unsigned int length_c;
+
+	if (s1 == NULL)
+		s1 = "";
+	if (s2 == NULL)
+		s2 = "";
+
+	for (length_S1 = 0; s1[length_S1] != '\0'; length_S1++)
+		;
+
+	for (length_S2 = 0; s2[length_S2] != '\0'; length_S2++)
+		;
+
+	length_c = length_S1 + length_S2;
+
+	concat = malloc((length_c + 1) * sizeof(char));
+	if (concat == NULL)
+		return (NULL);
+
+	for (i = 0; i < length_S1; i++)
+		concat[i] = s1[i];
+
+	for (j = 0; j < length_S2; i++, j++)
+		concat[i] = s2[j];
+
+	return (concat);
+}