adding superscript char

Makefile

@@ -134,7 +134,8 @@ SRCS	=	ft_memset.c \
 			ft_round.c \
 			ft_free_tab.c \
 			\
-			ft_arrint.c
+			ft_arrint.c \
+			ft_superscript.c
 
 
 ODIR	=	./builds

includes/libft.h

@@ -137,5 +137,6 @@ int ft_sqrt(int i);
 void ft_free_tab(char **tab);
 
 int ft_arrint(int *intarr, int comp, size_t size);
+const char *ft_superscript(char c);
 
 #endif

srcs/ft_superscript.c

@@ -0,0 +1,32 @@
+#include "libft.h"
+
+/**
+ * Converts a single digit character (0-9) to its superscript string representation.
+ *
+ * @param c The digit character (e.g., '0', '1', ..., '9').
+ * @return A static string containing the superscript representation of the digit.
+ *         Returns NULL if the input is not a digit.
+ */
+const char *ft_superscript(char c)
+{
+    // Array of superscript digit strings (UTF-8 literals)
+    static const char *superscript_digits[10] = {
+        "\xE2\x81\xB0", // ⁰ (U+2070)
+        "\xC2\xB9",     // ¹ (U+00B9)
+        "\xC2\xB2",     // ² (U+00B2)
+        "\xC2\xB3",     // ³ (U+00B3)
+        "\xE2\x81\xB4", // ⁴ (U+2074)
+        "\xE2\x81\xB5", // ⁵ (U+2075)
+        "\xE2\x81\xB6", // ⁶ (U+2076)
+        "\xE2\x81\xB7", // ⁷ (U+2077)
+        "\xE2\x81\xB8", // ⁸ (U+2078)
+        "\xE2\x81\xB9"  // ⁹ (U+2079)
+    };
+
+    if (c < '0' || c > '9')
+    {
+        return NULL; // Not a digit
+    }
+    int digit = c - '0';
+    return superscript_digits[digit];
+}