Merge pull request #75 from azymohliad/master

Implement strstr() and strpbrk() from string.h

tests/string/strpbrk.c

@@ -0,0 +1,20 @@
+#include <string.h>
+#include <stdio.h>
+
+int main(int argc, char* argv[]) {
+    char* source = "The quick drawn fix jumps over the lazy bug";
+
+    // should be "The quick drawn fix jumps over the lazy bug"
+    char* res1 = strpbrk(source, "From The Very Beginning");
+    printf("%s\n", (res1) ? res1 : "NULL"); 
+
+    // should be "lazy bug"
+    char* res2 = strpbrk(source, "lzbg");
+    printf("%s\n", (res2) ? res2 : "NULL"); 
+
+    // should be "NULL"
+    char* res3 = strpbrk(source, "404");
+    printf("%s\n", (res3) ? res3 : "NULL"); 
+
+    return 0;
+}

tests/string/strstr.c

@@ -0,0 +1,18 @@
+#include <string.h>
+#include <stdio.h>
+
+int main(int argc, char* argv[]) {
+    // should be "rust"
+    char* res1 = strstr("In relibc we trust", "rust");
+    printf("%s\n", (res1) ? res1 : "NULL"); 
+
+    // should be "libc we trust"
+    char* res2 = strstr("In relibc we trust", "libc");
+    printf("%s\n", (res2) ? res2 : "NULL"); 
+
+    // should be "NULL"
+    char* res3 = strstr("In relibc we trust", "bugs");
+    printf("%s\n", (res3) ? res3 : "NULL"); 
+
+    return 0;
+}