otp generation and encryption added with go

Go/pad_definitions/pad_definitions.go

@@ -0,0 +1,40 @@
+package paddefinitions
+
+var NumToCharMap = map[int]string{
+	0: "9",
+	1: "A",
+	2: "B",
+	3: "C",
+	4: "D",
+	5: "E",
+	6: "F",
+	7: "G",
+	8: "H",
+	9: "I",
+	10: "J",
+	11: "K",
+	12: "L",
+	13: "M",
+	14: "N",
+	15: "O",
+	16: "P",
+	17: "Q",
+	18: "R",
+	19: "S",
+	20: "T",
+	21: "U",
+	22: "V",
+	23: "W",
+	24: "X",
+	25: "Y",
+	26: "Z",
+	27: "0",
+	28: "1",
+	29: "2",
+	30: "3",
+	31: "4",
+	32: "5",
+	33: "6",
+	34: "7",
+	35: "8",
+}