Update README.md

fix(name):replace name of file by frontback
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+## frontback
+
+### Instructions
+
+Write a program that prints the previous letter and the next letter of the Latin alphabet.
+- If the number of arguments is different from 1, print (`'\n'`).
+- If the length of the argument is different from 1, print (`'\n'`)
+- If the argument is not a letter, print (`'\n'`)
+- There are no letters to print before 'a' or after 'z'.
+
+### Usage
+
+```console
+$ go run . | cat -e 
+$
+$ go run . a | cat -e
+ab$
+$ go run . "B" | cat -e
+ABC$
+$ go run . "z" | cat -e
+yz$
+$ go run . "Hello World!" | cat -e
+$
+$ go run . "1" | cat -e
+$
+```
Author	SHA1	Message	Date
Hamza elkhatri	478d72a419	Update README.md	2 years ago
Hamza elkhatri	a045e7ddc7	Update README.md	2 years ago
hamza	09d944a14c	fix(name):replace name of file by frontback	2 years ago
Hamza elkhatri	979569155e	Update README.md	2 years ago
Hamza elkhatri	ea3209a0a0	Update README.md	2 years ago
Hamza elkhatri	120692c5f6	Update README.md	2 years ago
Hamza elkhatri	1e16609804	Remove one level of bullet points	2 years ago
Hamza elkhatri	be41a07c7b	Update README.md	2 years ago
hamza	44f8692018	add inscrutions title and edit title	2 years ago
hamza	56dde3d3a1	remove duplicated title	2 years ago
hamza	96db7e9558	fix(bracket): add bracket to \n	2 years ago
hamza	c69dbf3738	feat: add new exam exercise	2 years ago