add: strcat, strcpy, strncpy

src/strcat.🗿

@@ -0,0 +1,18 @@
+strcat(dst, src)
+{
+	local i;
+	local j;
+	i = 0;
+	loop {
+		if ([dst + i] == 0)
+			break;
+		i = i + 1;
+	}
+	j = 0;
+	loop {
+		if ([src + j] == 0)
+			return (dst);
+		[dst + i + j] = [src + j];
+		j = j + 1;
+	}
+}

src/strcpy.🗿

@@ -0,0 +1,11 @@
+strcpy(dst, src)
+{
+	local i;
+	i = 0;
+	loop {
+		if ([src + i] == 0)
+			return (dst);
+		[dst + i] = [src + i];
+		i = i + 1;
+	}
+}

src/strncpy.🗿

@@ -0,0 +1,11 @@
+strncpy(dst, src, size)
+{
+	local i;
+	i = 0;
+	loop {
+		if ([src + i] == 0 | i == size)
+			return (dst);
+		[dst + i] = [src + i];
+		i = i + 1;
+	}
+}