diff --git a/0x0B-malloc_free/100-argstostr.c b/0x0B-malloc_free/100-argstostr.c
index 72d8d61..5abcbd2 100644
--- a/0x0B-malloc_free/100-argstostr.c
+++ b/0x0B-malloc_free/100-argstostr.c
@@ -1,45 +1,52 @@
-#include <stdlib.h>
 #include "main.h"
+#include <stdlib.h>
 
 /**
- * *argstostr - concatenates all the arguments of the program
- * @ac: number of arguments
- * @av: array of arguments
+ * argstostr - concatenates all the arguments of a program.
+ * @ac: argument count.
+ * @av: argument vector.
  *
- * Return: Pointer to the new string (Success), NULL (Error)
+ * Return: pointer of an array of char
  */
 char *argstostr(int ac, char **av)
 {
-	int i, j, k, len;
-	char *str;
+	char *aout;
+	int c, i, j, ia;
 
-	if (ac == 0 || av == NULL)
+	if (ac == 0)
 		return (NULL);
 
-	for (i = 0; i < ac; i++)
+	for (c = i = 0; i < ac; i++)
 	{
+		if (av[i] == NULL)
+			return (NULL);
+
 		for (j = 0; av[i][j] != '\0'; j++)
-			len++;
-		len++;
+			c++;
+		c++;
 	}
 
-	str = malloc(sizeof(char) * (len + 1));
+	aout = malloc((c + 1) * sizeof(char));
 
-	if (str == NULL)
+	if (aout == NULL)
+	{
+		free(aout);
 		return (NULL);
+	}
 
-	k = 0;
-
-	for (i = 0; i < ac; i++)
+	for (i = j = ia = 0; ia < c; j++, ia++)
 	{
-		for (j = 0; av[i][j] != '\0'; j++)
+		if (av[i][j] == '\0')
 		{
-			str[k] = av[i][j];
-			k++;
+			aout[ia] = '\n';
+			i++;
+			ia++;
+			j = 0;
 		}
-		str[k] = '\n';
-		k++;
+		if (ia < c - 1)
+			aout[ia] = av[i][j];
 	}
+	aout[ia] = '\0';
 
-	return (str);
+	return (aout);
 }
diff --git a/0x0B-malloc_free/101-strstow.c b/0x0B-malloc_free/101-strstow.c
new file mode 100644
index 0000000..4b48941
--- /dev/null
+++ b/0x0B-malloc_free/101-strstow.c
@@ -0,0 +1,67 @@
+#include "main.h"
+#include <stdlib.h>
+
+/**
+ * ch_free_grid - frees a 2 dimensional array.
+ * @grid: multidimensional array of char.
+ * @height: height of the array.
+ *
+ * Return: no return
+ */
+void ch_free_grid(char **grid, unsigned int height)
+{
+	if (grid != NULL && height != 0)
+	{
+		for (; height > 0; height--)
+			free(grid[height]);
+		free(grid[height]);
+		free(grid);
+	}
+}
+
+/**
+ * strtow - splits a string into words.
+ * @str: string.
+ *
+ * Return: pointer of an array of integers
+ */
+char **strtow(char *str)
+{
+	char **aout;
+	unsigned int c, height, i, j, a1;
+
+	if (str == NULL || *str == '\0')
+		return (NULL);
+	for (c = height = 0; str[c] != '\0'; c++)
+		if (str[c] != ' ' && (str[c + 1] == ' ' || str[c + 1] == '\0'))
+			height++;
+	aout = malloc((height + 1) * sizeof(char *));
+	if (aout == NULL || height == 0)
+	{
+		free(aout);
+		return (NULL);
+	}
+	for (i = a1 = 0; i < height; i++)
+	{
+		for (c = a1; str[c] != '\0'; c++)
+		{
+			if (str[c] == ' ')
+				a1++;
+			if (str[c] != ' ' && (str[c + 1] == ' ' || str[c + 1] == '\0'))
+			{
+				aout[i] = malloc((c - a1 + 2) * sizeof(char));
+				if (aout[i] == NULL)
+				{
+					ch_free_grid(aout, i);
+					return (NULL);
+				}
+				break;
+			}
+		}
+		for (j = 0; a1 <= c; a1++, j++)
+			aout[i][j] = str[a1];
+		aout[i][j] = '\0';
+	}
+	aout[i] = NULL;
+	return (aout);
+}