How to Avoid Panics and \"Hello Friends%!(EXTRA string=world)\" Errors When Using fmt.Sprintf in Golang?

Ignoring Extraneous Fields in fmt.Sprintf

In a Golang program that utilizes fmt.Sprintf to format a string based on a command-line parameter (e.g., tmp_str), there may arise situations where an entire string is passed instead of a template. This can lead to panics and the infamous "Hello Friends%!(EXTRA string=world)" error.

To resolve this issue and ignore extra fields in fmt.Sprintf, one technique is to ensure a consistent %s verb. If the string lacks a %s verb, users can either truncate it to zero length (Hello Friends%.0s) or use a concise %s verb (Hello Friends%.s). This ensures that any additional text after the verb is ignored, resulting in the desired plain output, such as "Hello Friends."

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