chore: declare variable

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---

Author: ShabiShett07

lib/node_modules/@stdlib/stats/base/dists/gumbel/skewness/src/main.c

@@ -21,6 +21,13 @@
 #include "stdlib/math/base/special/riemann_zeta.h"
 #include "stdlib/constants/float64/pi.h"
 
+// VARIABLES //
+
+static const double SKEWNESS = 12.0 * stdlib_base_sqrt( 6.0 ) * stdlib_base_zeta( 3.0 ) / ( STDLIB_CONSTANT_FLOAT64_PI*STDLIB_CONSTANT_FLOAT64_PI*STDLIB_CONSTANT_FLOAT64_PI );
+
+
+// MAIN //
+
 /**
 * Returns the skewness for a Gumbel distribution with location `mu` and scale `beta`.
 *
@@ -33,8 +40,6 @@
 * // returns ~1.14
 */
 double stdlib_base_dists_gumbel_skewness( const double mu, const double beta ) {
-	double SKEWNESS = 12.0 * stdlib_base_sqrt( 6.0 ) * stdlib_base_zeta( 3.0 ) / ( STDLIB_CONSTANT_FLOAT64_PI*STDLIB_CONSTANT_FLOAT64_PI*STDLIB_CONSTANT_FLOAT64_PI );
-
 	if (
 		stdlib_base_is_nan( mu ) ||
 		stdlib_base_is_nan( beta ) ||