Solution to reverse string in Bash

bash/reverse-string/.exercism/config.json

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+{
+  "authors": [
+    "sjwarner-bp"
+  ],
+  "contributors": [
+    "bkhl",
+    "budmc29",
+    "glennj",
+    "guygastineau",
+    "IsaacG",
+    "kotp",
+    "ZapAnton"
+  ],
+  "files": {
+    "solution": [
+      "reverse_string.sh"
+    ],
+    "test": [
+      "reverse_string.bats"
+    ],
+    "example": [
+      ".meta/example.sh"
+    ]
+  },
+  "blurb": "Reverse a string.",
+  "source": "Introductory challenge to reverse an input string",
+  "source_url": "https://medium.freecodecamp.org/how-to-reverse-a-string-in-javascript-in-3-different-ways-75e4763c68cb"
+}

bash/reverse-string/.exercism/metadata.json

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+{"track":"bash","exercise":"reverse-string","id":"daeb5e8dc1824a2bbfea9ad9a8941cfc","url":"https://exercism.org/tracks/bash/exercises/reverse-string","handle":"Kimawari","is_requester":true,"auto_approve":false}