CHALLENGE / MEDIUM

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Run Length Encoding

Compress consecutive equal characters into character followed by its count. Return an empty string for empty input.

Input["aaabb"]Expected output"a3b2"

Input["abc"]Expected output"a1b1c1"

Mode: Function (automatic calls). Eight tests: two public and six hidden.

The test harness calls your function automatically. No stdin or console.log is required.

No execution requested.

Test 1: ["aaabb"] → "a3b2" Not run

Test 2: ["abc"] → "a1b1c1" Not run

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