feat: add 5 new tools (decimal_to_hex, hex_to_decimal, gcd, factorial, octal_to_decimal)

tools/decimal_to_hex.py

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+# tool: decimal_to_hex
+# description: Converts a decimal integer to its hexadecimal string
+# author: @chfr19820610-cell
+# example: decimal_to_hex "255" -> "ff"
+
+def run(*args) -> str:
+    n = int(args[0])
+    return hex(n)[2:]

tools/factorial.py

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+# tool: factorial
+# description: Computes the factorial of a non-negative integer
+# author: @chfr19820610-cell
+# example: factorial "5" -> "120"
+
+import math
+
+def run(*args) -> str:
+    n = int(args[0])
+    return str(math.factorial(n))

tools/gcd.py

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+# tool: gcd
+# description: Finds the greatest common divisor of two integers
+# author: @chfr19820610-cell
+# example: gcd "12" "8" -> "4"
+
+import math
+
+def run(*args) -> str:
+    a = int(args[0])
+    b = int(args[1])
+    return str(math.gcd(a, b))

tools/hex_to_decimal.py

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+# tool: hex_to_decimal
+# description: Converts a hexadecimal string to its decimal integer value
+# author: @chfr19820610-cell
+# example: hex_to_decimal "ff" -> "255"
+
+def run(*args) -> str:
+    hex_str = args[0]
+    return str(int(hex_str, 16))

tools/octal_to_decimal.py

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+# tool: octal_to_decimal
+# description: Converts an octal string to its decimal integer value
+# author: @chfr19820610-cell
+# example: octal_to_decimal "77" -> "63"
+
+def run(*args) -> str:
+    octal = args[0]
+    return str(int(octal, 8))