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<div class="textblock"><p>Trim String - a simple string operation assignment</p>
<h1><a class="anchor" id="intoduction"></a>
Introduction</h1>
<p>A function trim() shall remove all leading and trailing whitespace characters. Whitespace characters are space (' ' ), tabulator ('\t'), new line ('<br />
'), and line feed ('\r') charaters.</p>
<p>The function should be implemented in two variants: One variant copies a part of a string into another. The other variant manipulates the original string without creating a copy.</p>
<p>If we consider the string </p><pre>" This string can be trimmed . "</pre><p> the trimmed version of it would be </p><pre>"This string can be trimmed ."</pre><h1><a class="anchor" id="assignment"></a>
Assignment</h1>
<ol type="1">
<li>Implement the non-copying variant function <code>trim()</code> such that all unit tests pass.</li>
<li>Implement the copying variant function <code>trim_cpy()</code> such that all unit tests pass.</li>
<li>Avoid code duplication, functionality that is useful for each variant shall be implemented in private(!) functions.</li>
<li>Avoid copying character by character (inefficient), use the appropriate <code>strcpy</code> function for this purpose.</li>
<li>Implement the newly created main() function such that it accpets a string as command line argument and<ol type="a">
<li>Stage 1: prints the command line arguments via printf().</li>
<li>Stage 2: copies the command line arguments via strcpy() or sprintf() or character by character (a method you did not use when implementing trim()) into a newly declared character array of length 512.</li>
<li>Stage 3: calls the function trim() and outputs the result into the <code>stdout</code>.</li>
<li>A 'usage' line shall be printed to <code>stdout</code> if the number of actual command line arguments does not match the number of expected arguments. </li>
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